Malicious PDF — malware analysis report

Static analysis result for SHA-256 9150dfc9018e6170…

MALICIOUS

PDF

73.2 KB Created: 2021-09-23 23:48:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e1f1f5f5c47c5a2926c7cafd9e50419f SHA-1: b56269a88de51d313078e15efc18a3f25130c07f SHA-256: 9150dfc9018e617080100babc9fe8e12e663557b28756bad29f453422b13990d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is a PDF that contains multiple links to external websites, several of which are hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of link farm heuristics suggests an attempt to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://2478.ru/admin/ckfinder/userfiles/files/58897263041.pdf In PDF document text
    • http://anabakorea.jp/userfiles/file/36524001055.pdfIn PDF document text
    • http://master-br.ru/img/file/42566820582.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_22_19_01_58_9040.pdfIn PDF document text
    • https://infotechsystemsonline.com/ital/www/img/file/35046973750.pdfIn PDF document text
    • http://royalgroup.at/tmp/35653784758.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/7865781108.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16147c503125e0---27571976735.pdfIn PDF document text
    • http://studioingegneramato.com/userfiles/files/39231877432.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/58780458659.pdfIn PDF document text
    • https://10fci.org/userfiles/file/fojix.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/61566373439.pdfIn PDF document text
    • http://doctour.hu/uploads/ckfinder/userfiles/files/dovilopejobedako.pdfIn PDF document text
    • http://3dprofi.net/images/uploads/file/64153604715.pdfIn PDF document text
    • http://phyllisrubensteinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bosanenovavoxunagasu.pdfIn PDF document text
    • http://kuryakyn.ru/userfiles/file/xumukakuzekasogovaliwiz.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/34585959332.pdfIn PDF document text
    • http://chochosanencino.com/uploads/files/84506177598.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffddbcd124---zojajudumopixasul.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b27886dacf---46050993410.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/xomop.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/2021917438536269.pdfIn PDF document text
    • https://budapestpainter.hu/ckfinder/userfiles/files/49411816945.pdfIn PDF document text
    • https://adeptos.clevercloud.pt/images/items/files/59755028095.pdfIn PDF document text
    • http://anm-av.de/uploads/files/23239699619.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/44683095953.pdfIn PDF document text
    • http://kbinteriery.cz/userfiles/file/58118478872.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=android+login+uiPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000be6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE6E 16628 bytes
SHA-256: 513aa9d000926275c8bc64592cf7ff63226269452d0827141f578fd1cd60d809
font_01_sfnt_off0000e9a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A2 9944 bytes
SHA-256: 7fd294a816ab0533f4166b021ce649c0a8c055c1d0a36cf077579ab67c67510a
font_02_sfnt_off0000ff6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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